Add slides, switch between slides

3 files changed, 150 insertions, 15 deletions

diff --git a/src/mainwindow.c b/src/mainwindow.c
index 64d854e..c54e6f1 100644
--- a/src/mainwindow.c
+++ b/src/mainwindow.c
@@ -87,6 +87,120 @@ static gint about_sig(GtkWidget *widget, struct presentation *p)
 }
 
 
+static void update_toolbar(struct presentation *p)
+{
+	GtkWidget *d;
+
+	d = gtk_ui_manager_get_widget(p->ui, "/ui/displaywindowtoolbar/first");
+	gtk_widget_set_sensitive(GTK_WIDGET(d), TRUE);
+	d = gtk_ui_manager_get_widget(p->ui, "/ui/displaywindowtoolbar/prev");
+	gtk_widget_set_sensitive(GTK_WIDGET(d), TRUE);
+	d = gtk_ui_manager_get_widget(p->ui, "/ui/displaywindowtoolbar/next");
+	gtk_widget_set_sensitive(GTK_WIDGET(d), TRUE);
+	d = gtk_ui_manager_get_widget(p->ui, "/ui/displaywindowtoolbar/last");
+	gtk_widget_set_sensitive(GTK_WIDGET(d), TRUE);
+
+	if ( p->view_slide_number == 0 ) {
+
+		d = gtk_ui_manager_get_widget(p->ui,
+					"/ui/displaywindowtoolbar/first");
+		gtk_widget_set_sensitive(GTK_WIDGET(d), FALSE);
+		d = gtk_ui_manager_get_widget(p->ui,
+					"/ui/displaywindowtoolbar/prev");
+		gtk_widget_set_sensitive(GTK_WIDGET(d), FALSE);
+
+	}
+
+	if ( p->view_slide_number == p->num_slides-1 ) {
+
+		d = gtk_ui_manager_get_widget(p->ui,
+					"/ui/displaywindowtoolbar/next");
+		gtk_widget_set_sensitive(GTK_WIDGET(d), FALSE);
+		d = gtk_ui_manager_get_widget(p->ui,
+					"/ui/displaywindowtoolbar/last");
+		gtk_widget_set_sensitive(GTK_WIDGET(d), FALSE);
+
+	}
+}
+
+
+static gint add_slide_sig(GtkWidget *widget, struct presentation *p)
+{
+	struct slide *new;
+
+	new = add_slide(p, p->view_slide_number);
+	p->view_slide = new;
+	p->view_slide_number++;
+	p->editing_object = NULL;
+
+	update_toolbar(p);
+
+	gdk_window_invalidate_rect(p->drawingarea->window, NULL, FALSE);
+
+	return FALSE;
+}
+
+
+static gint first_slide_sig(GtkWidget *widget, struct presentation *p)
+{
+	p->view_slide_number = 0;
+	p->view_slide = p->slides[0];
+	p->editing_object = NULL;
+
+	update_toolbar(p);
+
+	gdk_window_invalidate_rect(p->drawingarea->window, NULL, FALSE);
+
+	return FALSE;
+}
+
+
+static gint prev_slide_sig(GtkWidget *widget, struct presentation *p)
+{
+	if ( p->view_slide_number == 0 ) return FALSE;
+
+	p->view_slide_number--;
+	p->view_slide = p->slides[p->view_slide_number];
+	p->editing_object = NULL;
+
+	update_toolbar(p);
+
+	gdk_window_invalidate_rect(p->drawingarea->window, NULL, FALSE);
+
+	return FALSE;
+}
+
+
+static gint next_slide_sig(GtkWidget *widget, struct presentation *p)
+{
+	if ( p->view_slide_number == p->num_slides-1 ) return FALSE;
+
+	p->view_slide_number++;
+	p->view_slide = p->slides[p->view_slide_number];
+	p->editing_object = NULL;
+
+	update_toolbar(p);
+
+	gdk_window_invalidate_rect(p->drawingarea->window, NULL, FALSE);
+
+	return FALSE;
+}
+
+
+static gint last_slide_sig(GtkWidget *widget, struct presentation *p)
+{
+	p->view_slide_number = p->num_slides-1;
+	p->view_slide = p->slides[p->view_slide_number];
+	p->editing_object = NULL;
+
+	update_toolbar(p);
+
+	gdk_window_invalidate_rect(p->drawingarea->window, NULL, FALSE);
+
+	return FALSE;
+}
+
+
 static void add_menu_bar(struct presentation *p, GtkWidget *vbox)
 {
 	GError *error = NULL;
@@ -101,15 +215,15 @@ static void add_menu_bar(struct presentation *p, GtkWidget *vbox)
 			NULL, NULL,  G_CALLBACK(about_sig) },
 
 		{ "AddSlideAction", GTK_STOCK_ADD, "Add Slide",
-			NULL, NULL, NULL },
+			NULL, NULL, G_CALLBACK(add_slide_sig) },
 		{ "ButtonFirstSlideAction", GTK_STOCK_GOTO_FIRST, "First Slide",
-			NULL, NULL, NULL },
+			NULL, NULL, G_CALLBACK(first_slide_sig) },
 		{ "ButtonPrevSlideAction", GTK_STOCK_GO_BACK, "Previous Slide",
-			NULL, NULL, NULL },
+			NULL, NULL, G_CALLBACK(prev_slide_sig) },
 		{ "ButtonNextSlideAction", GTK_STOCK_GO_FORWARD, "Next Slide",
-			NULL, NULL, NULL },
+			NULL, NULL, G_CALLBACK(next_slide_sig) },
 		{ "ButtonLastSlideAction", GTK_STOCK_GOTO_LAST, "Last Slide",
-			NULL, NULL, NULL },
+			NULL, NULL, G_CALLBACK(last_slide_sig) },
 
 	};
 	guint n_entries = G_N_ELEMENTS(entries);
@@ -130,6 +244,8 @@ static void add_menu_bar(struct presentation *p, GtkWidget *vbox)
 	gtk_window_add_accel_group(GTK_WINDOW(p->window),
 				   gtk_ui_manager_get_accel_group(p->ui));
 	gtk_ui_manager_ensure_update(p->ui);
+
+	update_toolbar(p);
 }
 
 
diff --git a/src/presentation.c b/src/presentation.c
index dc4adbc..4dc9e59 100644
--- a/src/presentation.c
+++ b/src/presentation.c
@@ -34,19 +34,14 @@
 #include "objects.h"
 
 
-struct slide *add_slide(struct presentation *p)
+struct slide *add_slide(struct presentation *p, int pos)
 {
 	struct slide **try;
 	struct slide *new;
-
-	try = realloc(p->slides, (1+p->num_slides)*sizeof(struct slide *));
-	if ( try == NULL ) return NULL;
-	p->slides = try;
+	int i;
 
 	new = malloc(sizeof(struct slide));
 	if ( new == NULL ) return NULL;
-	/* Doesn't matter that p->slides now has some excess space -
-	 * it'll get corrected the next time a slide is added or deleted. */
 
 	/* No objects to start with */
 	new->num_objects = 0;
@@ -60,8 +55,31 @@ struct slide *add_slide(struct presentation *p)
 	new->render_cache = NULL;
 	render_slide(new);  /* Render nothing, just to make the surface exist */
 
-	p->slides[p->num_slides++] = new;
-	printf("Now %i slides\n", p->num_slides);
+	try = realloc(p->slides, (1+p->num_slides)*sizeof(struct slide *));
+	if ( try == NULL ) {
+		free(new);
+		return NULL;
+	}
+	p->slides = try;
+
+	if ( (p->num_slides>1) && (pos<p->num_slides-1) ) {
+
+		for ( i=p->num_slides; i>pos+1; i-- ) {
+			p->slides[i] = p->slides[i-1];
+		}
+		p->slides[pos+1] = new;
+
+	} else if ( pos == p->num_slides-1 ) {
+
+		p->slides[pos+1] = new;
+
+	} else {
+		assert(pos == 0);
+		p->slides[pos] = new;
+	}
+
+	p->num_slides++;
+
 	return new;
 }
 
@@ -146,7 +164,7 @@ struct presentation *new_presentation()
 	/* Add one blank slide and view it */
 	new->num_slides = 0;
 	new->slides = NULL;
-	new -> view_slide = add_slide(new);
+	new->view_slide = add_slide(new, 0);
 	new->view_slide_number = 0;
 
 	new->editing_object = NULL;
diff --git a/src/presentation.h b/src/presentation.h
index 28f324b..a96d215 100644
--- a/src/presentation.h
+++ b/src/presentation.h
@@ -72,6 +72,7 @@ struct presentation
 
 
 extern struct presentation *new_presentation(void);
+extern struct slide *add_slide(struct presentation *p, int pos);
 extern int add_object_to_slide(struct slide *s, struct object *o);
 extern void remove_object_from_slide(struct slide *s, struct object *o);
 extern struct object *find_object_at_position(struct slide *s,